I am puzzled by your (and Mojo's) experience as well. I wonder if the slope of the cross-over is low, such as 12 or 6dB/octave, instead of the usual 24dB/octave. In this sceneraio, M80s are still in business at 40Hz, playing 6-12dB lower in effort. Is there a way you can adjust or see what the cross-over slope is?
John


John
Our HT